crypto: ccp: Add Platform Security Processor (PSP) device support

The Platform Security Processor (PSP) is part of the AMD Secure
Processor (AMD-SP) functionality. The PSP is a dedicated processor
that provides support for key management commands in Secure Encrypted
Virtualization (SEV) mode, along with software-based Trusted Execution
Environment (TEE) to enable third-party trusted applications.

Note that the key management functionality provided by the SEV firmware
can be used outside of the kvm-amd driver hence it doesn't need to
depend on CONFIG_KVM_AMD.

Cc: Paolo Bonzini <[email protected]>
Cc: "Radim Krčmář" <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Gary Hook <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Improvements-by: Borislav Petkov <[email protected]>
Signed-off-by: Brijesh Singh <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>

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